Failed on valid schema

https://raw.githubusercontent.com/OAI/OpenAPI-Specification/main/examples/v3.0/uspto.yaml

```
.pnpm/openapi-preset-effector@0.3.2/node_modules/openapi-preset-effector/src/index.js:114
            createInterface(schema || content['application/json'].schema),
                                             ^

TypeError: Cannot read properties of undefined (reading 'application/json')
```